Computer Network Security directs the student to develop methodologies for the control and audit of computerized information systems. Techniques of control assessment are presented for both stand-alone and integrated transaction processing systems in various file and database structured environments. Specific control and security procedures for various hardware platforms are analyzed. Topics include: security threats, preventing, detecting and dealing with viruses, security standards, authentication methods, encryption methods, access control, LAN security, firewall: TCP/IP and Internet security, and security policies.